The U.S. has more than 87,000 dams greater than six feet high (and two million overall). While many dams continue to provide benefits such as flood control, irrigation, and water supply, for other dams the cost of maintenance or the negative effects on communities, fish, and tribes justifies their removal.
Dam owners and regulators decide whether to remove a dam by weighing many factors including: the cost of removal and the ability to replace any lost power generation against avoided long-term maintenance; safety concerns; benefits to endangered fish populations; increased recreational and commercial fishing; and restoration of cultural values of nearby tribes.
By 2020, roughly 70% of dams will be more than 50 years old, inviting us to reconsider the value to the public of long-term investments in this infrastructure.
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1)Trim trees and shrubs around your home so that they are more wind-resistant. 2)Clear loose and clogged rain gutters and downspouts. 3)Reinforce garage doors so wind doesn't enter and cause structural damage.
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Tides also differ at different times of the year depending on the location of the Moon and Sun in relation to Earth. At times when the Sun, Earth, and Moon are in line with each other (during full and new moons), the tidal range is larger because both the Sun's and Moon's gravitational pull create the tide.
